JP2010264673A - Resin molding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin molding device which improves mass productivity of an overmold bottle. <P>SOLUTION: A branch resin flow passage 103 which is sequentially branched and communicated from at least one resin inflow port 101 to a plurality of resin outflow ports 102 is formed. A plurality of overmold molds 300 are individually connected to each of the plurality of resin outflow ports 102, and an insert bottle 500 is maintained in the inner part. A resin pressure feed mechanism 200 pressure-feeds a molten resin to a resin inflow port 101, and therefore the overmold molding wherein an overmold resin is molded on the outer surface of the insert bottle 500 is simultaneously executed with the plurality of overmolds 300. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a resin molding apparatus for injection molding a resin, and more particularly to a resin molding apparatus for injecting a molten resin to the outside of an insert bottle to mold an overmold resin.

  An overmolded container that molds an overmolded resin (outer shell) by injecting molten resin to the outside of a plastic insert bottle (inner shell) as a container that contains fluid liquids such as lotion, chemicals, and beverages Has been proposed.

  In such an overmold container, the insert bottle and the overmold resin can be made of different materials. For this reason, the container according to the characteristic of a thing can be implement | achieved, for example, request | requires corrosion resistance for an insert bottle, and calculates | requires mechanical strength for overmold resin.

  Here, when overmolding the overmold resin on the outside of the insert bottle, it is necessary to suppress the displacement of the insert bottle relative to the overmold die.

  In addition, when both the insert bottle and the overmold resin are in the shape of a square bottle or have a specific decoration on each, it is necessary to determine the direction of the insert bottle relative to the overmold mold and perform overmold molding. is there.

  On the other hand, in the resin molding apparatuses described in Documents 1 and 2, a male screw is formed on the outer peripheral surface of the cylindrical neck portion of the insert bottle, and the female screw to be screwed with the male screw is a circular hole portion of the overmold die. By forming it on the inner peripheral surface, the insert bottle is fixed inside the overmolding die.

International Publication No. 2008/010597 Pamphlet International Publication No. 2008/010600 Pamphlet JP 2000-006194 A

  However, in the above-described injection molding apparatus, the insert bottle is fixed to the overmold die unless the insert bottle is rotated many times and the male screw in the cylindrical neck portion is not screwed into the female screw in the circular hole portion of the overmold die. Can not do it.

  For this reason, the operation | work which fixes an insert bottle to an overmold metal mold is complicated, and the automation etc. are not easy. For this reason, the productivity of the overmold bottle in which the overmold resin is molded into the insert bottle is reduced.

  In order to solve the problems as described above, the present applicant invented a technique that can be fixed to an overmold die without rotating the insert bottle, and filed this as Japanese Patent Application No. 2008-190240.

  According to the invention of the above application, the mass productivity of the overmold bottle can be improved. However, further improvement in mass productivity of overmolded bottles is currently demanded.

  This invention is made | formed in view of the above subjects, and provides the resin molding apparatus which can improve the mass-productivity of an overmold bottle. In mass production, it is possible to take a large number of pieces, but it is necessary to precisely control the inner bottle so that the inner bottle is not displaced from a predetermined position by the molten resin flow injected into the mold or the bottle itself is not deformed. Another object of the present invention is to provide a resin molding apparatus for multi-molding which can be precisely controlled so that the inner bottle is not displaced or deformed.

  The resin molding apparatus according to the present invention includes a flow path forming member in which a branched resin flow path is formed that is sequentially branched and communicated from at least one resin flow inlet to a plurality of resin flow outlets, and a resin in the branch resin flow path A resin pumping mechanism for pumping molten resin to the inlet, a plurality of overmold dies each forming a plurality of overmold cavities communicating with each of the plurality of resin outlets of the branch resin flow path, and a plurality of overmolds A plurality of bottle holding mechanisms that hold insert bottles that are overmolded with molten resin in each overmold cavity of the mold.

  Therefore, in the resin molding apparatus of the present invention, a branched resin flow path is formed in the flow path forming member that is sequentially branched and communicated from at least one resin flow inlet to a plurality of resin flow outlets. A resin pumping mechanism pumps the molten resin to the resin inlet of the branched resin channel. A plurality of overmold dies each form a plurality of overmold cavities communicating with each of the plurality of resin outlets of the branch resin flow path. A plurality of bottle holding mechanisms hold insert bottles that are overmolded with molten resin in each of the overmold cavities of the plurality of overmold dies. For this reason, the overmold molding in which the overmold resin is molded on the outer surface of the insert bottle is simultaneously performed with a plurality of overmold dies.

  Further, in the resin molding apparatus as described above, the insert bottle has a male thread formed on the outer circumferential surface of the cylindrical neck portion whose end surface is open, and the male screw has a slit portion in the axial direction at a plurality of locations in the circumferential direction. In the bottle holding mechanism, a rib-like portion that is detachably engaged with the slit portion may be formed on the inner peripheral surface of the circular hole portion into which the cylindrical neck portion is detachably inserted.

  Further, in the resin molding apparatus as described above, a hot runner nozzle that injects molten resin from the resin outlet into the overmold mold, and a fluid pumping mechanism that pumps fluid into the insert bottle held in the overmold cavity; Synchronizing at least one of the temperature, flow rate, and pressure of the molten resin flowing from the hot runner nozzle into the overmold mold and at least one of the temperature, flow rate, and pressure of the fluid pumped by the fluid pumping mechanism to the insert bottle And molding control means for controlling.

  Moreover, in the resin molding apparatus as described above, the molding control means may control at least one of the temperature, flow rate, and pressure of the molten resin flowing into the overmolding die by the hot runner nozzle.

  In the resin molding apparatus as described above, the molding control means controls at least one of the temperature, flow rate, and pressure of the molten resin with a hot runner nozzle for each of the plurality of overmold dies and for each of the plurality of insert bottles. In addition, at least one of the temperature, the flow rate, and the pressure of the fluid may be controlled by the fluid pumping mechanism.

  Further, in the resin molding apparatus as described above, the hot runner nozzle further has a resin injection mechanism for injecting a molten resin that has been previously metered to a predetermined volume, and the molding control means has a plurality of overruns by the hot runner nozzle. The molten resin injected for each mold may be adjusted to a predetermined capacity.

  The various constituent elements of the present invention need only be formed so as to realize the function, for example, dedicated hardware that exhibits a predetermined function, resin molding in which a predetermined function is given by a computer program It can be realized as an apparatus, a predetermined function realized in the resin molding apparatus by a computer program, an arbitrary combination thereof, or the like.

  The various components of the present invention do not necessarily have to be independent of each other. A plurality of components are formed as a single member, and a single component is formed of a plurality of members. It may be that a certain component is a part of another component, a part of a certain component overlaps with a part of another component, or the like.

  In the resin molding apparatus of the present invention, a branched resin flow path is formed in the flow path forming member that is branched and communicated sequentially from at least one resin inlet to a plurality of resin outlets. A resin pumping mechanism pumps the molten resin to the resin inlet of the branched resin channel. A plurality of overmold dies each form a plurality of overmold cavities communicating with each of the plurality of resin outlets of the branch resin flow path. A plurality of bottle holding mechanisms hold insert bottles that are overmolded with molten resin in each of the overmold cavities of the plurality of overmold dies. For this reason, the overmold molding in which the overmold resin is molded on the outer surface of the insert bottle is simultaneously performed with a plurality of overmold dies. Therefore, the mass productivity of the overmold bottle can be improved. In a further preferred embodiment, since a resin injection mechanism is provided for each hot runner nozzle that pumps molten resin into the overmold cavity, the displacement and deformation of the inner bottle during overmolding can be greatly reduced, and the desired overmold is achieved. Molded products can be molded with high yield.

It is a typical longitudinal section front view showing the whole resin molding device structure of an embodiment of the invention. It is a double view which shows the external appearance of an insert bottle. It is a typical vertical front view which shows the process of loading an insert bottle in an overmold metal mold | die. It is a typical vertical front view which shows the process of shape | molding overmold resin and completing an overmold bottle. It is a typical front view which shows the state which attaches a bottle cap to the completed overmold bottle. It is a typical longitudinal section front view showing the whole resin molding device structure of one modification. It is a typical longitudinal section front view showing the internal structure of a hot runner nozzle. It is a typical front view showing the connection structure of a plurality of hot runner nozzles and a resin injection mechanism.

  An embodiment of the present invention will be described below with reference to the drawings. In the present embodiment, description will be made by defining the front-rear, left-right, up-down directions as shown. However, this is provided for the sake of convenience in order to briefly explain the relative relationship between the components. Therefore, the direction at the time of manufacture and use of the product which implements the present invention is not limited.

  As shown in FIG. 1, the resin molding apparatus 1000 according to the present embodiment is formed with a branched resin flow path 103 that is sequentially branched and communicated from at least one resin inlet 101 to a plurality of resin outlets 102. The flow path forming member 100, the resin pumping mechanism 200 that pumps the molten resin to the resin inlet 101 of the branch resin flow path 103, and a plurality of individually communicating with each of the plurality of resin outlets 102 of the branch resin flow path 103. A plurality of overmold dies 300 each forming an overmold cavity 301, and an insert bottle 500 overmolded with molten resin in each of the overmold cavities 301 of the plurality of overmold dies 300 at the bottom is a resin outlet And a plurality of bottle holding mechanisms 400 that hold so as to face 102.

  More specifically, the insert bottle 500 is formed of, for example, a so-called PET bottle, and has a square column-shaped hollow bottle body 510 and a cylindrical neck portion 520 having an upper end opening as shown in FIG.

  For example, the bottom of the bottle body 510 is closed flat, and the upper part is formed in a quadrangular pyramid shape and communicates with a small-diameter cylindrical neck 520. An annular stopper 521 is formed on the outer periphery of the base of the cylindrical neck 520.

  The insert bottle 500 is made of a resin material such as polyolefin, polyester, or polyamide, and a transparent synthetic resin is preferably used in view of the contents. Specifically, it can be selected from the viewpoints of heat resistance, impact resistance, corrosion resistance, decorativeness, aesthetics, and the like. For this reason, insert bottles (not shown) made of heat-resistant glass are also frequently used.

  For example, polyester or polyamide is preferably used because of high melting temperature, and polyethylene or polypropylene or the above ionomer resin is preferably used because of high corrosion resistance. The resin material may be mixed with light reflecting powder to improve the aesthetics of the overmold bottle 600.

  Further, a male screw 522 is formed on the outer peripheral surface of the cylindrical neck portion 520. As shown in the figure, the male screw 522 has slit portions 523 formed in the axial direction at a plurality of locations in the peripheral surface direction. Yes.

  Therefore, as shown in FIG. 3, the bottle holding mechanism 400 is formed with a circular hole portion 410 into which the cylindrical neck portion 520 is detachably inserted, and the inner peripheral surface of the bottle holding mechanism 400 is detachably engaged with the slit portion 523. A rib-like portion 411 is formed.

  The overmold mold 300 includes first / second split molds 310 and 320. When the first / second split molds 310 and 320 are joined, the overmold cavity 301 communicates with the overmold cavity 301 at the upper part. Thus, a resin flow passage 302 into which the molten resin flows is formed.

  A rectangular parallelepiped space is formed in the lower part of the overmold mold 300 communicating with the overmold cavity 301, and a rectangular parallelepiped bottle holding mechanism 400 is detachably attached thereto.

  In the bottle holding mechanism 400 and the overmold mold 300, air is supplied from the inside of the insert bottle 500, and an air supply passage 303 through which a cooled fluid, for example, air, is pumped to the inside center of the held insert bottle 500. A pair of air exhaust passages 304 to be exhausted are formed.

  The fluid supplied to the inside of the bottle does not need to be a gas, and may be a liquid such as water, or may be a gas or a liquid that fills the bottle as a product. Moreover, the place to supply does not need to be the center of a bottle opening part. Since the cooled fluid is supplied to the inside of the bottle, a resin bottle that cannot be normally used as an inner bottle can also be used.

  On the other hand, in the resin molding apparatus 1000 of the present embodiment, as shown in FIG. 1, the branched resin flow of the flow path forming member 100 in which the resin pumping mechanism 200 is mounted on at least one resin inlet 101 as described above. A plurality of resin outlets 102 are formed by sequentially branching the passage 103, and a plurality of overmold dies 300 are individually connected to each of the plurality of resin outlets 102 via a plurality of hot runner nozzles 210 individually. It is connected.

  The hot runner nozzle 210 injects the molten resin that is pumped to the resin pumping mechanism 200 and flows out from the resin outlet 102 of the branch resin flow path 103 into the resin flow path 302 of the overmold die 300.

  In the resin molding apparatus 1000 of the present embodiment, the heater members 110 are arranged at various locations of the branched resin flow path 103 in order to cause the molten resin to flow through the complicated and long branched resin flow path 103 as described above. . For this reason, the molten resin flowing through the complicated and long branched resin flow path 103 is maintained at an appropriate temperature and viscosity by heating the heater member 110.

  The heater member (not shown) as described above is also incorporated in the hot runner nozzle 210, and the hot runner nozzle 210 heats the molten resin injected into the overmold mold 300 to an appropriate temperature.

  In the configuration as described above, the injection molding method by the resin molding apparatus 1000 of the present embodiment will be described in order below. First, as shown in FIG. 2, an insert bottle 500 in which slits 523 are formed in the axial direction at a plurality of positions in the circumferential direction on the male screw 522 of the cylindrical neck 520 is prepared.

  Next, as shown in FIG. 3, the cylindrical neck portion 520 of the insert bottle 500 is inserted into the circular hole portion 410 of the bottle holding mechanism 400 so that the slit portion 523 engages with the rib-like portion 411.

  Since the insert bottle 500 is now held by the bottle holding mechanism 400, the bottle holding mechanism 400 is mounted on the overmold mold 300 including the first / second split molds 310 and 320.

  When a plurality of overmold dies 300 are prepared as described above, the overmold dies 300 are attached to each of the plurality of hot runner nozzles 210 of the resin molding apparatus 1000 as shown in FIG.

  At this time, a cold pressure feeding mechanism (not shown) is connected to the air supply flow path 303 of the overmold mold 300, and an air exhaust mechanism (not shown) is also connected to the pair of air discharge flow paths 304.

  In the state as described above, the molten resin pumped by the resin pumping mechanism 200 is sequentially branched by the branch resin flow path 103 and individually injected from the plurality of hot runner nozzles 210 to the plurality of overmold dies 300. At this time, since the molten resin flowing through the branched resin flow path 103 is heated to an appropriate temperature by the heater member 110, an appropriate viscosity is maintained.

  Further, since the hot runner nozzle 210 also injects the molten resin by heating it appropriately, the overmold resin 610 is molded in the overmold cavity 301 in the overmold die 300 as shown in FIG.

  The overmold resin 610 is integrally molded on the outer surface of the insert bottle 500. Since the cooled air flows at a predetermined pressure in the insert bottle 500, the insert mold 500 is inserted due to the pressure of the injected molten resin. It is possible to prevent the bottle 500 from being deformed.

  As the material of the overmold resin 610, a styrene resin such as an ionomer resin, an acrylic resin, a polyester resin, an ethylene / (meth) acrylic acid copolymer resin, or a styrene / acrylonitrile copolymer resin can be used. Can be used as an ionomer resin, a polyester resin, an ethylene / (meth) acrylic acid copolymer resin, and more preferably an ionomer resin.

  As the ionomer resin, for example, a resin obtained by neutralizing at least a part of carboxyl groups of an ethylene / unsaturated carboxylic acid copolymer having an unsaturated carboxylic acid content of 1 to 40% by mass with a metal ion can be used.

  The ethylene / unsaturated carboxylic acid copolymer used as the base polymer of the ionomer resin is obtained by copolymerizing ethylene, an unsaturated carboxylic acid, and any other polar monomer.

  Examples of the metal ion include metal ions having a valence of 1 to 3, particularly IA, IIA, IIIA, IVA, and a metal ion having a valence of 1 to 3 in group III in the periodic table. Specifically, the material of the overmold resin 610 is selected from the viewpoint of impact resistance, transparency, aesthetics, and the like.

  As described above, when the overmold resin 610 is integrally overmolded on the outer surface of the insert bottle 500, the overmold bottle 600 is completed. Therefore, as shown in FIG. 4B, the first / second divided molds 310 and 320 are opened, the overmold bottle 600 is taken out, and the resin runner 601 solidified in the resin flow passage 302 is cut off.

  At this time, when the first / second split molds 310 and 320 are opened, the overmold bottle 600 is pulled out without rotating from the bottle holding mechanism 400. However, since the male screw 522 of the cylindrical neck portion 520 of the overmold bottle 600 functions normally even if a plurality of slit portions 523 are formed, a female screw 621 is formed on the inner peripheral surface as shown in FIG. The bottle cap 620 is detachably screwed.

  In the resin molding apparatus 1000 of the present embodiment, the branched resin flow path 103 that is sequentially branched and communicated from the at least one resin inlet 101 to the plurality of resin outlets 102 is connected to the flow path forming member 100 as described above. Is formed.

  The resin pumping mechanism 200 pumps the molten resin to the resin inlet 101 of the branched resin channel 103. The plurality of overmold dies 300 each form a plurality of overmold cavities 301 that individually communicate with each of the plurality of resin outlets 102 of the branch resin flow path 103.

  The plurality of bottle holding mechanisms 400 hold the insert bottles 500 overmolded with molten resin in each of the overmold cavities 301 of the plurality of overmold dies 300 so that the bottom faces the resin outlet 102.

  For this reason, overmold molding in which an overmold resin is molded on the outer surface of the insert bottle 500 is simultaneously executed by the plurality of overmold dies 300. Therefore, the mass productivity of the overmold bottle 600 can be improved.

  In particular, the insert bottle 500 has a male screw 522 formed on the outer peripheral surface of a cylindrical neck portion 520 having an open end surface, and the male screw 522 has slit portions 523 formed in the axial direction at a plurality of locations in the circumferential direction. Yes.

  In the bottle holding mechanism 400, a rib-like portion 411 that is detachably engaged with the slit portion 523 is formed on the inner peripheral surface of the circular hole portion 410 into which the cylindrical neck portion 520 is detachably inserted.

  For this reason, in order to place the insert bottle 500 inside the overmold mold 300, the cylindrical neck portion 520 may be inserted into the circular hole portion 410 of the bottle holding mechanism 400 in the axial direction.

  That is, it is not necessary to rotate the male screw 522 of the cylindrical neck 520 to the female screw (not shown) of the bottle holding mechanism 400 and screw it. For this reason, the insert bottle 500 can be appropriately and simply disposed inside the overmold mold 300, and the mass productivity of the overmold bottle 600 can be improved.

  Moreover, in the resin molding apparatus 1000 of the present embodiment, the insert bottle 500 is inserted into the bottle holding mechanism 400 by engaging the slit portion 523 and the rib-like portion 411 and inserting the cylindrical neck portion 520 into the circular hole portion 410. It is held.

  For this reason, the holding of the insert bottle 500 is not strong as compared with the screwing of the male screw and the female screw. However, in the resin molding apparatus 1000 of the present embodiment, as described above, the bottle holding mechanism 400 holds the insert bottle 500 so that the bottom part faces the resin outlet 102.

  Accordingly, the dynamic pressure of the molten resin that is injected from the resin outlet 102 into the overmold cavity 301 and acts on the insert bottle 500 acts in a direction that assists the holding by the bottle holding mechanism 400. For this reason, it is possible to favorably suppress the displacement of the insert bottle 500 due to the dynamic pressure of the molten resin injected into the overmold cavity 301.

  The present invention is not limited to the present embodiment, and various modifications are allowed without departing from the scope of the present invention. For example, in the above embodiment, the male thread 522 is formed on the outer peripheral portion of the cylindrical neck portion 520 of the insert bottle 500 and the slit portion 523 is formed, and the rib-like portion 411 to which the male screw 522 is engaged is the circular hole portion of the bottle holding mechanism 400. It is illustrated that it is formed in 410. However, the cylindrical neck portion of the insert bottle is formed in a snap fit, and the rib-shaped portion may not be formed in the circular hole portion of the bottle holding mechanism (not shown).

  Moreover, in the said form, while the molten resin pumped by the resin pumping mechanism 200 is heated by the hot runner nozzle 210 and injected into the overmold mold 300, it is inserted into the insert bottle 500 held in the overmold mold 300. Only the cooling air was allowed to flow at a predetermined pressure.

  However, in the resin molding apparatus 1000 as described above, at least one of the temperature, flow rate, and pressure of the molten resin flowing from the hot runner nozzle 210 into the overmold mold 300, and the temperature of the cold air fed to the insert bottle 500 At least one of the flow rate and the pressure may be controlled in synchronization (not shown). In this case, it can be expected that the overmold bottle 600 is overmolded more quickly and accurately.

  For example, in the above embodiment, it is assumed that the hot runner nozzle 210 is a simple nozzle that is not dynamically controlled. However, the hot runner nozzle 210 may be dynamically controlled to control at least one of the temperature, flow rate, and pressure of the molten resin flowing into the overmold mold 300.

  In this case, the resin molding apparatus (not shown) controls at least one of the temperature, the flow rate, and the pressure of the molten resin by the hot runner nozzle 210 for each of the plurality of overmold dies 300, and the plurality of insert bottles 500. It is sufficient to control at least one of the temperature, flow rate, and pressure of the fluid for each.

  For example, in the resin molding apparatus 1000 of the present embodiment, the insert bottle 500 is bottled by engaging the slit portion 523 and the rib-like portion 411 and inserting the cylindrical neck portion 520 into the circular hole portion 410 as described above. It is held by the holding mechanism 400.

  For this reason, the insert bottle 500 may be displaced depending on the flow rate of the molten resin injected from the hot runner nozzle 210 to the overmold mold 300. Such a displacement becomes a problem even when the insert bottle 500 is not a PET bottle but a heat-resistant glass bottle.

  Therefore, when the above-described problem occurs, it is preferable to control the flow rate of the molten resin with the hot runner nozzle 210 within a range in which the insert bottle 500 is not displaced.

  Further, if the pressure of the cooling air acting on the inner surface is abnormally higher than the pressure of the molten resin acting on the outer surface of the insert bottle 500, the insert bottle 500 may fall off the bottle holding mechanism 400.

  Therefore, even when the slit portion 523 and the rib-like portion 411 are engaged to hold the cylindrical neck portion 520 in the circular hole portion 410, the molten resin and the cooling air are prevented so that the insert bottle 500 does not fall out of the bottle holding mechanism 400. It is preferable to control the pressure in synchronization with each other.

  In the above embodiment, the insert bottle 500 is heated from the outside with the molten resin and air-cooled with the cooling air from the inside. Therefore, it is also preferable to control the temperature and flow rate of the molten resin and the cooling air in synchronism so that the insert bottle 500 is not heated abnormally or deformed due to a pressure difference.

  In particular, when the overmold bottle 600 is formed by simultaneously injecting molten resin from the plurality of hot runner nozzles 210 to the plurality of overmold dies 300 as described above, the plurality of hot runner nozzles 210 can be individually controlled. Is preferred.

  In this case, even if there are individual differences in the mechanical strength of the plurality of insert bottles 500, the plurality of overmolded bottles 600 can be mass-produced uniformly corresponding to the individual differences.

  Moreover, in the resin molding apparatus as described above, the hot runner nozzle may have a resin injection mechanism for injecting a molten resin that has been previously metered to a predetermined capacity. More specifically, like the resin molding apparatus 2000 illustrated in FIGS. 6 to 8, the hot runner nozzle 700 is slidable inside the nozzle cylinder 711 as, for example, a resin injection mechanism 710 that injects molten resin. The nozzle piston 712 is disposed, the piston piston 712 is connected to a piston plunger 713, and a piston link mechanism 714 for sliding is provided.

  According to this mechanism, since a plurality of independent nozzle pistons 712 can be braked by a single piston plunger 713, the structure of the apparatus is extremely simplified. In the present invention, it is possible to manufacture the overmold bottle 600 with reduced displacement and deformation only with this mechanism.

  In addition, the resin outlet 802 of the branched resin flow path 803 of the flow path forming member 800 is connected to the lower side surface of the hot runner nozzle 700 as described above. The resin outlet 802 is formed with, for example, a flow path gate 810 that limits the injected molten resin to a predetermined predetermined volume.

  In such a resin molding apparatus 2000, for example, the molten resin injected from each of the plurality of hot runner nozzles 700 is individually measured in advance. Then, for example, the home positions of the nozzle cylinders 711 of the plurality of hot runner nozzles 700 are individually adjusted so that the plurality of hot runner nozzles 700 inject the same predetermined volume of molten resin.

  Therefore, even when the nozzle cylinders 711 of the plurality of hot runner nozzles 700 are uniformly slid with one piston plunger 713, the same predetermined volume of molten resin is injected into the plurality of overmold dies 300. .

  For this reason, the deformation and displacement of the insert bottle 500 arranged in the overmold cavity 301 of the overmold mold 300 can be well prevented, and the deformation and displacement of the overmold resin 610 to be molded is also well prevented. be able to. For this reason, the high quality overmold bottle 600 can be mass-produced uniformly.

  Moreover, in the said form, after preparing the overmold metal mold | die 300, connecting to the hot runner nozzle 210 was illustrated. However, a structure in which the first split mold 310 is connected to the hot runner nozzle 210 from the beginning and the second split mold 320 is opened and closed is also possible (not shown).

  Furthermore, in the said form, it illustrated that the 1st / 2nd division | segmentation metal mold | die 310,320 of the overmold metal mold | die 300 and the bottle holding mechanism 400 were formed in the detachable separate body. However, such a bottle holding mechanism 400 may be formed integrally with one of the first / second divided molds 310 and 320 (not shown).

  Further, in FIG. 1, for ease of illustration and description, the branched resin flow path 103 is simply branched in a two-dimensional shape, and the flow path diameter is also uniform. However, the branched resin flow path 103 may actually be branched in three dimensions, and the flow path diameter need not be uniform (not shown).

  Furthermore, the branched resin flow path 103 was repeatedly branched into two equal lengths, and the communication from one resin inlet 101 to eight resin outlets 102 was illustrated. However, it is not impossible (not shown) that the branched resin flow path is formed in a shape in which the branched resin flow paths are branched into two or more unequal lengths.

  Needless to say, the above-described embodiment and a plurality of modifications can be combined within a range in which the contents do not conflict with each other. Further, in the above-described embodiments and modifications, the structure of each part has been specifically described, but the structure and the like can be changed in various ways within a range that satisfies the present invention.

DESCRIPTION OF SYMBOLS 100 Flow path formation member 101 Resin inlet 102 Resin outlet 103 Branch resin flow path 110 Heater member 200 Resin pressure feed mechanism 210 Hot runner nozzle 300 Overmold die 301 Overmold cavity 302 Resin flow path 303 Air supply path 304 Air discharge Flow path 310 First divided mold 320 Second divided mold 400 Bottle holding mechanism 410 Circular hole 411 Rib-shaped portion 500 Insert bottle 510 Bottle body 520 Cylindrical neck portion 521 Stopper portion 522 Male screw 523 Slit portion 600 Overmold bottle 601 Resin runner 610 Overmold resin 620 Bottle cap 621 Female thread 700 Hot runner nozzle 710 Resin injection mechanism 711 Nozzle cylinder 712 Nozzle piston 713 Piston plunger 714 Pi Stone link mechanism 800 Channel forming member 802 Resin outlet 803 Branch resin channel 810 Channel gate 1000 Resin molding device 2000 Resin molding device

Claims (5)

A flow path forming member in which a branched resin flow path is formed that is sequentially branched and communicated from at least one resin inlet to a plurality of resin outlets;
A resin pumping mechanism for pumping molten resin to the resin inlet of the branch resin flow path;
A plurality of overmold dies each forming a plurality of overmold cavities communicating individually with each of the plurality of resin outlets of the branch resin flow path;
A plurality of bottle holding mechanisms for holding insert bottles overmolded with the molten resin in the overmold cavities of each of the plurality of overmold dies;
A resin molding apparatus. A hot runner nozzle that injects the molten resin from the resin outlet into the overmold mold;
A fluid pumping mechanism for pumping fluid into the insert bottle held in the overmold cavity;
At least one of the temperature, flow rate, and pressure of the molten resin flowing from the hot runner nozzle into the overmold mold, and the temperature, flow rate, and pressure of the fluid that is pumped by the fluid pumping mechanism to the insert bottle. Molding control means for controlling one in synchronization;
The resin molding apparatus of Claim 1 which has these.   The resin molding apparatus according to claim 2, wherein the molding control unit controls at least one of a temperature, a flow rate, and a pressure of the molten resin flowing into the overmold mold by the hot runner nozzle.   The molding control means controls at least one of the temperature, flow rate and pressure of the molten resin by the hot runner nozzle for each of the plurality of overmold dies and uses the fluid pressure feeding mechanism for each of the plurality of insert bottles. The resin molding apparatus according to claim 2 or 3, wherein at least one of a temperature, a flow rate, and a pressure of the fluid is controlled. The hot runner nozzle further has a resin injection mechanism for injecting the molten resin that has been previously metered to a predetermined capacity,
5. The resin molding apparatus according to claim 2, wherein the molding control unit adjusts the molten resin injected for each of the plurality of overmold dies to a predetermined capacity by the hot runner nozzle.

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